Great thread Lisa, and an issue I actually came across recently. I'm used to having the ethernet port available on my older Macbook Pro, and just recently bought the new one and noticed it doesn't have it. I really find it frustrating that Apple is removing quite essential ports.. like ethernet, and they also removed the mic input jack. And the fact that there are very little Thunderbolt devices, having less USB's is also an issue since I now need to use all the ports to plug in adapters for everything.
Right now, believe it or not, Staples has the best price at $29
http://www.staples.ca/en/Apple-Thund...0_2-CA_1_20001
You can bring that into Bestbuy or Futureshop and they'll match the price. Bestbuy is at 34.99 right now.
I'll be getting this adapter soon, I think it's definitely worth having. Especially if you're going to be at your desk in your dorm room and want the fastest internet possible.